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Density
determination to 6 decimal places |
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3
Column Density Gradient Apparatus |
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Facilitates the
testing of a wide range of materials in one apparatus.
The density gradient is formed by mixing two fluids having
different densities. The resulting solution has a variable
density which is calibrated using glass marker floats
of known density. |
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Supplied as standard are the
following features :- |
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Twin conical flask filling
apparatus with motorized magnetic stirrer |
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Automatic column clearing
device - sweep basket arrested automatically
at top and bottom of column and pivoted
for use over any of the 3 columns |
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Temperature accurate to
0.05 C with stability of 0.02 C over length of graduated
column
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Set of 8 calibrated glass
marker floats with fully traceable certification to
customer's specification
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Built-in cooling coil |
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Adjustable black / white
twin background to assist sighting different colour
samples
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Conforms to CE regulations
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Year 2000 Compliant
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Product user manual
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Fully traceable certificate
of calibration |
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1 year return to base warranty
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The Density Gradient
Apparatus |
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Three graduated glass tubes
are housed in a cylindrical Perspex water bath, maintained
at a constant temperature by a solid state control thermoregulator
and built-in cooling coil. A large diameter circulation
tube reaching to the bottom of the bath ensures a closely
controlled temperature over the whole length of the column.
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The use of three columns facilitates
the testing of a wide range of materials in one apparatus,
alternatively, when testing frequency or sample quantity
is high, three identical columns aid sample identification
and will enable the test to continue while one column
is being re-filled. If very low temperatures are required,
one column tube may be replaced by a refrigerated dip
cooler. |
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The Density Gradient
Columns |
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Two miscible solutions, which
have a density in excess of the range of density to be
investigated, are introduced into a graduated glass tube,
so that the resulting mixture varies at a linear rate
with reference to the height of the tube, the lowest density
at the top of the tube and the highest at the bottom.
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Calibrated glass marker floats
of precisely known density are introduced into the column
and fall to a point where their density matches that of
the solution. A range of suitable floats serve as a means
of calibrating the column and as a check on the linearity
of the column while in use. |
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Either graphical or statistical
methods are used to calibrate the column. |
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The column tube is graduated
in 2 mm divisions over a length of 700 mm, so that with
a density range of 0.1 cm each graduation will represent
0.0003 cm. |
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When a sample of unknown density
is introduced into the column, the measurement of its
height on reaching equilibrium will, when referred to
the floats, give a measure of its density to the 4th decimal
place. |
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The Column Filling Equipment |
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The Gravity Method "Slip
Under"
as described in both British and American International
Test Standards |
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The equipment consists of a platform mounted
above the column tube holding two 1 liter flasks connected
by a tap. The front flask is stirred by a magnetic stirrer
and has an outlet tap connected to a capillary tube inserted
into and reaching to the bottom of, the graduated column
tube. A liter each of two miscible solutions A and B are
prepared. Solution A at 20% below the lowest density required
and solution B at 30% above the highest density required.
With both taps closed, solution A is poured into
the front (stirred) flask and solution B into the rear
flask, the stirrer is switched on, and the interconnecting
tap opened.
When hydrostatic equilibrium exists, the outlet tap is
opened, delivering the lighter solution to the bottom
of the column tube, floating the less dense liquid above
it. This method has a progressively decreasing weight
of liquid in the flasks and the increasing pressure of
liquid above the solution outlet. |
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The Clearing Device
(Sweep Mechanism) |
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The columns can be cleared of
all specimens without disturbing the gradient by means
of a motorized sweep basket. The device is fitted on a
pivot arrangement so as to enable any of the three columns
to be swept. |
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Individual Glass Marker
Floats |
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FLOAT/001 : Glass Marker Float
(density up to 2.000 g/ml)
FLOAT/002 : Glass Marker Float (density over 2.000 g/ml)
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Electrical Characteristics |
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The equipment can be supplied
with either of the following electrical configurations
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220-240 volts 1 ph @ 50 Hz |
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100-120 volts 1 ph @ 60 Hz |
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Shipping Characteristics |
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Goods are packed in a strong,
durable wooden packing case suitable for export shipment
with the following shipping characteristics :- |
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Gross weight : 45 kg |
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Gross size : 140 cm x 41 cm
x 51 cm |
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